> wealth tax is on inheritance

As a point on terminology: That's not a really a wealth tax on the accumulated assets at-rest own by the (now eternally-resting) owner, but an income tax on the wealth as it moves to the recipients who didn't have it and are getting a massive gift.

It just happens to be a kind of gift/transfer we've decided because of tradition to consider as a special case, where (A) it happens right after a given dies and (B) the giver is frequently but not necessarily related to the recipient.